package org.example.SystemDemo.utils;

import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.UUID;

public class StringUtil {
    /**
     * 生成 uuid 字符串
     * @return uuid字符串
     */
    public static String uuid() {
        return UUID.randomUUID().toString().replaceAll("-", "");
    }

    /**
     * 获取文件后缀名,如果不存在默认为 jpg
     * @param filename 文件名
     * @return 后缀名
     */
    public static String getFileExtName(String filename){
        String defaultName = "jpg";
        if (filename == null)  return defaultName;
        String extName = filename.substring(filename.lastIndexOf("."));
        return  "".equals(extName) ? defaultName: extName ;
    }

    public static String getIpAddr(HttpServletRequest request) {
        String ipAddress = null;
        try {
            ipAddress = request.getHeader("x-forwarded-for");
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("WL-Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getRemoteAddr();
                if ("127.0.0.1".equals(ipAddress)) {
                    // 根据网卡取本机配置的IP
                    InetAddress inet = null;
                    try {
                        inet = InetAddress.getLocalHost();
                    } catch (UnknownHostException e) {
                        e.printStackTrace();
                    }
                    ipAddress = inet.getHostAddress();
                }
            }
            // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
            // "***.***.***.***".length()
            if (ipAddress != null && ipAddress.length() > 15) {
                // = 15
                if (ipAddress.indexOf(",") > 0) {
                    ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
                }
            }
        } catch (Exception e) {
            ipAddress="";
        }
        // ipAddress = this.getRequest().getRemoteAddr();

        return ipAddress;
    }

}
